Date: Sun, 17 Apr 2011 11:54:02 -0700 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: Lystopad Olexandr <laa@laa.zp.ua> Cc: freebsd-stable@freebsd.org Subject: Re: ZFS root on MB Intel S3420GP Message-ID: <20110417185402.GA55984@icarus.home.lan> In-Reply-To: <20110417184538.GG96423@laa.zp.ua> References: <20110417123232.GA96423@laa.zp.ua> <20110417142135.GA51568@icarus.home.lan> <20110417163135.GC96423@laa.zp.ua> <20110417183014.GA55444@icarus.home.lan> <20110417184538.GG96423@laa.zp.ua>
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On Sun, Apr 17, 2011 at 10:45:38PM +0400, Lystopad Olexandr wrote: > Hello, Jeremy Chadwick! > > > > > With regards to AHCI mode: Most of us strongly advocate use of ahci.ko > > > > (not ataahci.ko; they differ), which does SATA<->CAM translation. You > > > > also gain NCQ capability using this. Be aware your disks will appear as > > > > "adaX" (not a typo), and you will use "camcontrol" (rather than > > > > "atacontrol") to maintain them. Utilities like smartmontools do work > > > > with this. Many of us (users and developers) have been using ahci.ko > > > > reliably for 1-2 years now. > > > > > > Simply add ahci_load="YES" in loader.conf? Or something else? > > > > Correct. > > > > I tend to do the following from the very beginning of a new FreeBSD box > > installation, however: > > > > - Boot FreeBSD installation medium (PXE, CD, USB, whatever) > > - At beastie menu, escape to loader prompt and do "load ahci" then > > "boot" > > - Install FreeBSD like usual, creating slices/partitions on adaX disks > > like normal, etc... > > - When the system reboots, at the beastie prompt, make sure to escape to > > loader and do "load ahci" then "boot" again. > > - Once the system is finally up, edit /boot/loader.conf to add > > ahci_load="yes". > > What about ahci_load="YES" after freebsd install? Is it too late? I don't recommend enabling ahci.ko after the OS has already been installed on an adX disk, simply because I believe the combination of GEOM+CAM+ahci may show different geometry details than GEOM+ata would. Note: I said "I believe", not "I can confirm/validate". I could be completely wrong. Rather than find out ( :-) ) I tend to try and do things consistently from the very beginning. So you can try it if you want, be my guest, report back. -- | Jeremy Chadwick jdc@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP 4BD6C0CB |
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